Financial Infrastructure · Source-Available

Financial infrastructure you audit before you sign.

Source-available transaction lifecycle stack. Controls, ledger, reconciliation, orchestration, and regulatory reporting — as standalone products or a complete platform. Your cloud or ours.

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Transaction lifecycle

Tracer

Controls

Midaz

Ledger

Matcher

Reconciliation

Reporter

Reporting

Flowker

Orchestration

In production with

Cappta

Voluti

Banqi

La Finteca

Monetarie

More than 7.5M transactions/day in production

7.5M+

transactions/day in production

< 50ms

average decision latency

standalone or stackable products

deployment models: SaaS, BYOC, self-hosted

For developers

I'm a developer

The code is open. Read it before any sales conversation. If it doesn’t convince you, don’t book the call.

Go to docs View on GitHub

For business

I need a solution

21 modular building blocks — ledger, reconciliation, controls, orchestration, and regulatory reports. Source-available: read every line before signing anything. No SaaS-only lock-in. No proprietary DSL. Your cloud or ours.

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Products

Five products. One stack.

Each product solves a specific problem. Together, they cover the full financial lifecycle.

Midaz

Ledger

Stop rebuilding your ledger every time you scale.

Every customer of your customer is an isolated financial entity — not a workaround. Double-entry, multi-currency, immutable. Read every line of code before signing anything.

View on GitHub →

Matcher

Reconciliation

Close your books in hours, not days.

The auditor asks ‘why did this transaction match?’ You answer with the exact rule — not a probability score. Ingests from banks, PSPs, internal systems. No dependency on Midaz.

See how it works →

Tracer

Financial Controls

Catch the breach before it costs you.

Compliance sets the rule. Engineering doesn’t open a ticket. Sub-50ms. Every decision recorded and immutable. When the rule changes, you implement it the same day — not next quarter.

Learn about Tracer →

Flowker

Orchestration

Connect any system. Without writing middleware forever.

Validation, segregation of duties, and audit trail — all before the transaction hits the ledger. Not a generic iPaaS. Middleware that understands financial compliance.

Learn about Flowker →

Reporter

Regulatory Reporting

Pass audits. Without the spreadsheet hell.

Regulatory reports generated automatically. New regulator? It’s a template, not a refactor. Connects directly to PostgreSQL and MongoDB.

Learn about Reporter →

AI at Lerian

AI in delivery. Not in the product you operate.

A compliance implementation that would take 6 weeks and 3 consultants is delivered in days. Work that would take quarters ships in weeks. AI is in our delivery capacity \u2014 not in the infrastructure you run.

Delivery speed

Regulator publishes. Days later, it's implemented.

A bug is reported. Before your next deploy, it's fixed in production. Speed doesn't come from a large team — it comes from the right infrastructure applied to the right process. Ring — our engineering agent library — is public on GitHub.

View Ring on GitHub ·

PS AI-Powered

You buy the outcome. Not the consultant's hours.

A PIX Compliance assessment that would take Big4 6 weeks and $300/hr is delivered in days. With deeper analytical coverage. AI doesn't accelerate the old process — it is the new process.

Talk to the PS team ·

Community

Source-available. Audited. No black box.

Your CISO, your auditor, and your security team read every line before the contract. No trusting the vendor's word. ELv2 protects the product. BYOC protects your data.

View on GitHub ·

Global context

The infrastructure problem no one talks about until it's too late.

🔒

No lock-in. No black box. No renegotiation.

Source-available under ELv2. BYOC or Lerian Cloud. You read the code, choose where it runs, and don't renegotiate when you scale.

⚡

Every decision recorded. Immutable. Auditable.

"Why did this transaction match?" needs a rule, not a probability score. Deterministic systems answer that question. Probabilistic ones approximate it.

🏗️

Internal ledgers don't scale.

Two engineers maintaining a ledger nobody wants to touch. Every time volume spikes, something breaks. That's not infrastructure — that's technical debt.

🔍

BYOC or Lerian Cloud.

Data sovereignty is a requirement, not a differentiator. Your data stays in your cloud. The code is auditable. No black box. No vendor dependency.

Source-Available

Read every line. Fork nothing without a license.

Source-available under ELv2. Your CISO, your auditor, and your security team read every line of code before any signature. No black boxes. No trusting the vendor’s word.

View Midaz on GitHub Documentation

midaz-example.ts

// Midaz — create an account in the ledger
const account = await midaz.accounts.create({
  ledgerId: "ldg_01HX...",
  name: "Checking Account",
  type: "deposit",
  currency: "BRL",
  metadata: { owner: "customer_123" }
});
console.log(account.id); // acc_01HX...

Professional Services

The team that built the product is the team that implements yours.

No generic consultants. No intermediaries. Lerian PS is run by the same engineering team that built each product. Go live in weeks, not months.

Implementation

Go live in weeks. The team that built the product implements yours. Onboarding, configuration, integration with existing systems. No intermediaries.

Migration

Exit the legacy without stopping operations. Parallel run, integrity validation, controlled cutover. From spreadsheet, internal system, or another vendor.

Advisory

Ledger modeling, financial product design, compliance review. For teams building and wanting to get it right the first time — not the third.

AI-Powered Assessments

PIX Compliance, Ledger Audit, Reconciliation Health Check. Delivered in days. Coverage traditional consulting can't match. You buy the diagnosis, not the hours.

Talk to the PS team ·

Who uses it

Who Lerian was built for.

Fintechs & IPs

Native multi-tenant. Each customer of your customer is an isolated financial entity — not a workaround. Operate as an IP without rebuilding infrastructure.

Discuss payments ·

Digital Banks

Infrastructure that grows with you without rewriting the core. Double-entry, multi-currency, immutable. Real scale without the technical debt that follows internal ledgers.

Discuss core banking ·

Companies with Financial Operations

Marketplace, e-commerce, SaaS with billing. Any company that moves money needs a ledger. Start with Midaz standalone — add Matcher and Tracer when it makes sense.

Discuss financial ops ·

Cooperatives & Regional Banks

Exit the legacy without stopping operations. Parallel run, integrity validation, controlled cutover. The Lerian PS team has done this before — no surprises midway.

Discuss migration ·

Academy